Thanks for your concern Juro. I can imagine what you mean on your rivers. Allow me to show you what rivers in Holland are like.
I'll also show you the inshore condition the pontoon will be used in. For those in our region: IMHO this is the only inshore place safely fishable with regular bellyboats and pontoons, the so called "Blokkendam" west of Rotterdam. One of the premier spots for fly fishing for European Sea bass in Holland. This dam is made of concrete blocks 6'x6'x6', creating a completely closed kind of lagoon protruding into the North Sea. So one cannot drift to the open sea. Enjoy it while it lasts: within a couple of years it will be land creating an industrial estate being an extension of the Rotterdam harbour!!